I have this issue occasionally on my 03 coupe. i'll research and checkout the hoses on my car, see if cleaning them out is a viable option. I don't see the need for $100.00 for a hose, but I haven't been under there yet either.
I can see this one hose that's easy to access, but the rest of them look buried pretty good. I guess in theory I could remove this one hose and try to stick something through the tube and see if its clogged, maybe?